TW201349554A - Light emitting module - Google Patents

Abstract

A light emitting module is provided. The light emitting module includes a first light emitting element, and a plurality first light emitting element groups which are serial-connected. In addition, the light emitting module further includes a second light emitting element, and a second light emitting element group. Compared to the first light emitting element, a changing rate of a light emitting efficiency and a changing rate of the voltage of the second light emitting element relative to a variation of temperature are greater. The second light emitting element group includes a plurality of serial connected second light emitting elements, and the second light emitting element group is parallel connected to the first light emitting element group.

Description

Light module

The invention relates to a lighting module and a lighting device.

In recent years, an illumination device including a light-emitting element such as a light-emitting diode (LED) has been used as an illumination device. A lighting device including a light-emitting element can obtain higher brightness or illuminance with less power consumption than, for example, a conventional incandescent light bulb.

Here, in the illumination device including the light-emitting element, a plurality of types of light-emitting elements having different light-emitting colors may be mounted on the light-emitting module. In this case, the light output from the illumination device is light which is obtained by mixing light output from each of a plurality of types of light-emitting elements mounted on the light-emitting module. In other words, the luminescent color of the light output from the illuminating device is a color obtained by mixing the luminescent colors of the plurality of illuminating elements.

However, in the prior art, the output balance of the light outputted by each of the plurality of light-emitting elements sometimes changes. For example, when the temperature characteristics or current characteristics of the light-emitting elements mounted on the light-emitting module are different, when the brightness is adjusted by the change of the drive current, or the light output from the light-emitting elements is changed as the ambient temperature changes. The balance will change.

In other words, when the temperature characteristics or current characteristics of the plurality of light-emitting elements are different, the change in the amount of light emitted from each of the light-emitting elements becomes different as the temperature rises. As a result, when the temperature of the light-emitting element rises, the amount of light emitted by each of the light-emitting elements changes with a different amount of change, and as a result, the light is emitted. The balance of the light output of the module output changes.

The light emitting module of the embodiment includes: a first light emitting element group having a first light emitting element, and a plurality of the first light emitting elements are connected in series; and a second light emitting element group having a second light emitting element, and connected in series a plurality of the second light-emitting elements are connected, and are connected in parallel with the first light-emitting element group, and the rate of change of the light-emitting efficiency with respect to temperature change of the second light-emitting element compared with the first light-emitting element And the rate of change of voltage is greater.

The light-emitting module and the illumination device of an example of the embodiment have an advantageous effect of suppressing a change in the output balance of light outputted by each of the plurality of light-emitting elements.

Hereinafter, a light-emitting module and an illumination device according to an embodiment will be described with reference to the drawings. In the embodiments, the same reference numerals will be given to the components having the same functions, and the duplicated description will be omitted. In addition, the light-emitting module and the illumination device described in the following embodiments are merely examples, and the present invention is not limited. Further, the following embodiments may be combined as appropriate without departing from the scope of the invention.

The light-emitting module 10a to the light-emitting module 10c of the embodiment include, for example, a first light-emitting element, and includes a first light-emitting element group in which a plurality of first light-emitting elements are connected in series. In addition, the light emitting module 10a to the light emitting module 10c includes, for example, a second light emitting element, and includes a second light emitting element group, and the second light emitting element is compared with the first light emitting element to emit light with respect to temperature change. The rate of change of the efficiency and the rate of change of the voltage are larger. The second group of light emitting elements are connected in series to the plurality of second light emitting elements, and are connected in parallel with the first group of light emitting elements.

Further, in the light-emitting module 10a to the light-emitting module 10c of the embodiment, for example, the first light-emitting element group and the second light-emitting element group connected in parallel are connected to a common power supply path. In the case of lighting, even when the total amount of electric power supplied to each of the light-emitting element groups does not change, when the temperature of each of the light-emitting elements of each of the light-emitting element groups changes due to lighting, the light flows into each of the light-emitting elements. The current value of the component group also changes.

Further, in the light-emitting module 10a to the light-emitting module 10c of the embodiment, for example, the luminous efficiency and voltage of the first light-emitting element and the second light-emitting element decrease as the temperature rises, and rise as the temperature decreases.

Further, in the light-emitting module 10a to the light-emitting module 10c of the embodiment, for example, the first light-emitting element is a blue LED (Light Emitting Diodes) element, and the second light-emitting element is a red LED element.

Further, in the light-emitting module 10a to the light-emitting module 10c of the embodiment, for example, a first light-emitting element group in which a plurality of first light-emitting elements are connected in series and a plurality of second light-emitting elements are connected in series The second group of light emitting elements are connected in parallel. Further, the rated condition of the first light-emitting element group is equal to the rated condition of the second light-emitting element group.

Further, the light-emitting module 10a to the light-emitting module 10c of the embodiment include, for example, a plurality of first light-emitting element groups and a plurality of second light-emitting element groups. Further, the plurality of first light-emitting element groups are connected in parallel to the plurality of second light-emitting element groups.

Further, examples of the illumination device 100a to the illumination device 100c of the embodiment The lighting module 10a, the light-emitting module 10c, and the lighting device for supplying electric power to the light-emitting module 10a to the light-emitting module 10c are included.

In the following embodiments, the light-emitting element will be described as an LED (Light Emitting Diode), but the present invention is not limited thereto. For example, the light-emitting element may be an organic EL (OLED (Organic Light Emitting Diodes)), or may be another light-emitting element that emits light of a predetermined color due to current supply, such as a semiconductor laser.

In the following embodiments, the following description will be given as an example. In this case, the first light-emitting element is a blue LED (Light Emitting Diodes) element, and the second light-emitting element is a red LED element, but Limited to this. In other words, the second light-emitting element is only a light-emitting element that is connected in parallel with the first light-emitting element, and has a rate of change in luminous efficiency and a rate of change in voltage with respect to temperature change as compared with the first light-emitting element. Large, it can be any light-emitting element. For example, the first light-emitting element and the second light-emitting element may both be light-emitting elements that emit blue light, or may be any light-emitting elements.

Further, in the following embodiments, the LED is constituted, for example, by a diode chip including a gallium nitride (GaN) semiconductor having a blue illuminating color or an illuminating color. The red quaternary material (Al/In/Ga/P) compound is a semiconductor. Further, for example, the LEDs are mounted on a chip-on-board (COB) technology, and some or all of them are regularly arranged in a matrix, a zigzag shape, or a radial shape at regular intervals. Alternatively, the LED may be, for example, an LED constructed in the form of a surface mount device (SMD). another Further, in the following embodiments, the number of LEDs is configured by the same type of LEDs that can be changed in design according to the lighting use.

Further, in the following embodiments, the shape of the illumination device is a krypton bulb shape, but the shape of the illumination device may be a normal bulb shape, a bullet shape, or the like.

[First Embodiment]

(Configuration of illuminating device in which the light-emitting module of the first embodiment is mounted)

Fig. 1 is a longitudinal sectional view showing an illuminating device to which a light-emitting module of a first embodiment is attached. As shown in FIG. 1, the illumination device 100a of the first embodiment includes a light emitting module 10a. Further, the illumination device 100a includes a main body 11, a base member 12a, a metal eye portion 12b, a cover 13, a control portion 14, an electric wiring 14a, an electrode joint portion 14a-1, an electric wiring 14b, and an electrode joint portion 14b- 1.

The light emitting module 10a is disposed on the upper surface of the main body 11 in the vertical direction. The light emitting module 10a includes a substrate 1. The substrate 1 is formed of ceramics of low thermal conductivity such as alumina. For example, in a 300 [K] atmosphere, the thermal conductivity of the substrate 1 is 33 [W/m‧K].

When the substrate 1 is made of ceramics, the mechanical strength and dimensional accuracy are high. Therefore, the yield of the light-emitting module 10a during mass production is improved, the manufacturing cost of the light-emitting module 10a is reduced, and the light-emitting mode is made. The life of group 10a is extended. In addition, since ceramics have a high reflectance for visible light, the luminous efficiency of the LED module is improved.

Further, the substrate 1 may be formed using tantalum nitride, ruthenium oxide or the like without being limited to alumina. Further, the thermal conductivity of the substrate 1 is preferably 20 [W/m‧K] to 70 [W/m‧K]. When the thermal conductivity of the substrate 1 is 20 [W/m‧K] to 70 [W/m‧K], the manufacturing cost, the reflectance, and the thermal influence between the light-emitting elements mounted on the substrate 1 can be suppressed. Further, the substrate 1 formed of ceramic having a preferable thermal conductivity can suppress the thermal influence between the light-emitting elements mounted on the substrate 1 as compared with the substrate having a high thermal conductivity. Therefore, for the substrate 1 formed of ceramic having a preferable thermal conductivity, the separation distance between the light-emitting elements mounted on the substrate 1 can be shortened, and thus can be made smaller.

Further, the substrate 1 may be formed using a nitride of aluminum such as aluminum nitride. In this case, for example, in a 300 [K] atmosphere, the thermal conductivity of the substrate 1 is less than about 99.5% by mass of the thermal conductivity of aluminum, that is, 225 [W/m‧K].

In the light-emitting module 10a, for example, a blue LED 2a is disposed on the circumference of the upper surface of the substrate 1 in the vertical direction. Further, in the light-emitting module 10a, for example, a red LED 4a is disposed in the vicinity of the center of the upper surface of the substrate 1 in the vertical direction. When the red LED 4a is compared with the blue LED 2a, the amount of light emitted from the light-emitting element further decreases as the temperature of the light-emitting element rises. That is, the red LED 4a is inferior in thermal characteristics in comparison with the blue LED 2a in that the amount of light emitted from the light-emitting element further decreases as the temperature of the light-emitting element rises. In the first embodiment, since the substrate 1 is a ceramic having a low thermal conductivity, heat emitted from the blue LED 2a is suppressed from being transmitted to the red LED 4a via the substrate 1, and deterioration of the luminous efficiency of the red LED 4a is suppressed.

In addition, in FIG. 1, the blue LED 2a and the red LED 4a are abbreviate|omitted. In other words, the plurality of blue LEDs 2a are arranged on the circumference of the upper surface of the substrate 1 in the vertical direction as the first light-emitting element group. Further, a plurality of red LEDs 4a are arranged in the vicinity of the center of the upper surface of the substrate 1 in the vertical direction as the second light-emitting element group.

The first light-emitting element group including the plurality of blue LEDs 2a is covered by the sealing portion 3a from the upper portion. The sealing portion 3a has a substantially semicircular or substantially trapezoidal cross section in the upper surface of the substrate 1 in the vertical direction, and is formed in an annular shape so as to cover the plurality of blue LEDs 2a. Further, each of the concave portions of the second light-emitting element group including the plurality of red LEDs 4a is covered by the sealing portion 5a, and the concave portion is the inner surface of the ring formed by the sealing portion 3a and the substrate 1 form.

The sealing portion 3a and the sealing portion 5a can be formed into various members of various resins such as an epoxy resin, a urea resin, and an anthrone resin. The sealing portion 5a may be a transparent resin that does not contain a phosphor and has high diffusibility. The sealing portion 3a and the sealing portion 5a are formed of different kinds of resins. Further, the refractive index n1 of the light of the sealing portion 3a, the refractive index n2 of the light of the sealing portion 5a, and the refractive index n3 of the light of the gas enclosed in the space formed by the main body 11 and the outer cover 13 have, for example, n3 < n1 < The size relationship of n2. Hereinafter, the gas enclosed in the space formed by the main body 11 and the outer cover 13 is referred to as "enclosed gas". The enclosed gas is, for example, an atmosphere.

Further, an electrode 6a-1, which will be described later, of the light-emitting module 10a is connected to the electrode joint portion 14a-1. Further, an electrode 8a-1, which will be described later, of the light-emitting module 10a is connected to the electrode joint portion 14b-1.

The body 11 is formed of a metal having good thermal conductivity, for example, aluminum. The main body 11 has a substantially circular cylindrical cross section, and a cover 13 is attached to one end, and a cap member 12a is attached to the other end. Further, the main body 11 is formed such that the outer peripheral surface has a substantially conical inclined surface, and the diameter of the substantially conical inclined surface gradually decreases from one end to the other end. The appearance of the body 11 is configured as a shape that approximates the silhouette of the neck in the mini-tank bulb. The main body 11 is integrally formed with a plurality of fins that are radially protruded from one end to the other end on the outer peripheral surface and are not shown.

The cap member 12a is, for example, an Edison type E-shaped base, and includes a cylindrical casing made of a copper plate having a thread, and a conductive metal provided on the top of the lower end of the casing via an electrical insulating portion. Eye 12b. The opening of the outer casing is fixed electrically insulated from the opening of the other end of the body 11. An input line (not shown) is connected to the casing and the metal eye portion 12b, and the input line (not shown) is led out from a power input terminal of a circuit board (not shown) of the control unit 14.

The outer cover 13 constitutes a globe, and is formed, for example, by a milky white polycarbonate, and has a smooth curved shape similar to the outline of a mini-bright bulb having an opening at one end. The cover 13 is such that the light-emitting surface of the light-emitting module 10a is covered, and the opening end portion is fitted and fixed to the body 11. Thereby, the illuminating device 100a is configured as a lamp with a lamp cap, and the lamp with the cap includes an outer cover 13 or a lamp cover at one end, and an E-shaped cap member 12a at the other end, and the overall appearance shape is similar to that of the mini 氪 bulb. And can replace the mini light bulb. Furthermore, the method of fixing the outer cover 13 to the main body 11 may be any of bonding, fitting, screwing, and locking. method.

The control unit 14 accommodates a lighting device (not shown) such that the lighting device (not shown) is electrically insulated from the outside, and the lighting device (not shown) pairs the blue LED 2a and the red LED 4a attached to the substrate 1. The lighting is controlled. The control unit 14 converts the AC voltage into a DC voltage, and supplies the DC voltage to the blue LED a2 and the red LED 4a. Further, the electric wiring 14a for supplying power to the blue LED 2a and the red LED 4a is connected to the output terminal of the lighting device of the control unit 14. Further, the second electric wiring 14b is connected to an input terminal of the lighting device of the control unit 14. The electric wiring 14a and the electric wiring 14b are insulated and covered.

Here, the lighting device supplies electric power to the light-emitting modules 10a to 10c. Here, the first light-emitting element group and the second light-emitting element group connected in parallel to the light-emitting module 10a to the light-emitting module 10c are connected to the lighting device via a common power supply path. Even when the lighting is performed, the temperature of each of the light-emitting element groups changes, and the total amount of electric power supplied from the lighting device to each of the light-emitting element groups does not change. Further, the current value flowing into each of the light-emitting element groups by the lighting device changes as follows. In this case, the temperature of each light-emitting element group changes when lighting.

The electric wiring 14a is led to an opening of one end of the main body 11 via a through hole (not shown) formed in the main body 11 and a guide groove (not shown). The electrode joint portion 14a-1 of the electric wiring 14a is joined to the electrode 6a-1 of the wiring disposed on the substrate 1, and the electrode joint portion 14a-1 is a tip end portion in which the insulating coating is peeled off. The counter electrode 6a-1 will be described later.

In addition, the electric wiring 14b is formed via a body (not shown) formed in the main body 11 The through hole and the guide groove (not shown) are led out to the opening of one end of the body 11. The electrode bonding portion 14b-1 of the electric wiring 14b and the electrode 8a-1 of the wiring disposed on the substrate 1 are the front end portions of the electrode bonding portion 14b-1 which are insulated and coated. The counter electrode 8a-1 will be described later.

In this manner, the control unit 14 supplies electric power to the blue LED 2a and the red LED 4a via the electric wiring 14a, and the electric power is electric power input via the outer casing and the metal eye portion 12b. Further, the control unit 14 collects electric power supplied to the blue LED 2a and the red LED 4a via the electric wiring 14b.

(Configuration of Light Emitting Module of First Embodiment)

Fig. 2 is a plan view showing a light-emitting module of the first embodiment. FIG. 2 is a plan view of the light-emitting module 10a as seen from the direction of the arrow A in FIG. 1. As shown in FIG. 2, the first light-emitting element group including the plurality of blue LEDs 2a is regularly arranged in an annular shape on the circumference of the center of the substantially rectangular substrate 1. Further, the sealing portion 3a is annularly shaped and completely covers the first light-emitting element group including the plurality of blue LEDs 2a. A region of the substrate 1 covered by the sealing portion 3a is referred to as a first region.

Further, as shown in FIG. 2, the second light-emitting element group including the plurality of red LEDs 4a is regularly arranged in a lattice shape in the vicinity of the center of the substantially rectangular substrate 1. Further, the LED group including the plurality of red LEDs 4a is completely covered by the sealing portion 5a. Further, the sealing portion 5a completely covers the inside of the ring of the first region. A region of the substrate 1 covered by the sealing portion 5a is referred to as a second region.

In addition, since the details of the connection state of the blue LED 2a and the red LED 4a will be described later using FIG. 4, description thereof will be omitted.

Further, as shown in FIG. 2, the shortest distance among the distances between the blue LED 2a and the red LED 4a is defined as the distance D1 between the blue LED 2a and the red LED 4a. Further, the distance between the blue LED 2a and the red LED 4a is not limited to the shortest distance among the distances between the blue LED 2a and the red LED 4a, and may be the distance between the center position of the first light-emitting element group and the center position of the second light-emitting element group. In the example shown in FIG. 2, for example, the center position of the first light-emitting element group is a circumference passing through the centers of the blue LEDs 2a arranged in a ring shape. Further, for example, the center position of the second light-emitting element group is the center when the red LEDs 4a are arranged in a lattice shape. In this case, the distance between the blue LED 2a and the red LED 4a is the distance between the center when the red LED 4a is arranged in a lattice shape and one point on the circumference of each of the centers of the blue LEDs 2a arranged in an annular shape.

In the light-emitting module 10a, even if a plurality of types of LEDs having greatly different thermal characteristics are mixed and mixed on the ceramic substrate 1 in accordance with the type of the LED, the red LED 4a can be prevented from being subjected to the heat generated by the blue LED 2a. influences. Thereby, the light-emitting module 10a easily obtains desired light-emitting characteristics.

Further, the light-emitting module 10a is provided with, for example, a blue LED 2a and a red LED 4a in a separate region. Therefore, the light-emitting module 10a suppresses the heat generated by the blue LED 2a to the red LED 4a, for example, so that the thermal characteristics of the entire light-emitting module 10a are improved.

In addition, in FIG. 2, the number and position of the blue LED 2a and the red LED 4a are only an example, and may be arbitrary.

(Details of mounting of the light-emitting module of the first embodiment)

3 is a cross-sectional view showing an illumination device to which the light-emitting module of the first embodiment is mounted. 3 is a cross-sectional view taken along line B-B of the light-emitting module 10a of FIG. 2. In FIG. 3, the description of the outer cover 13 of the illuminating device 100a or the lower portion of the main body 11 has been omitted. As shown in FIG. 3, the main body 11 of the illuminating device 100a includes a concave portion 11a of the substrate 1 in which the light-emitting module 10a is housed, and a fixing member 15a and a fixing member 15b that fix the substrate 1. The substrate 1 of the light-emitting module 10a is housed in the recess 11a of the body 11.

Then, the edge portion of the substrate 1 is pressed against the lower portion of the concave portion 11a by the pressing force of the fixing member 15a and the fixing member 15b, whereby the light-emitting module 10a is fixed to the main body 11. Thereby, the light emitting module 10a is attached to the lighting device 100a. Furthermore, the method of attaching the light-emitting module 10a to the illumination device 100a is not limited to the method shown in FIG. 3, and may be any method such as bonding, fitting, screwing, and locking.

As shown in FIG. 3, the distance D1 between the blue LED 2a and the red LED 4a is longer than the thickness D2 of the substrate 1 in the vertical direction. On the substrate 1, the heat generated by the light emission of the blue LED 2a and the red LED 4a is more easily conducted in the horizontal direction than in the vertical direction. Therefore, for example, heat emitted from the blue LED 2a is conducted to the red LED 4a via the level direction of the substrate 1, and the luminous efficiency of the red LED 4a is further deteriorated. However, the distance D1 between the blue LED 2a and the red LED 4a is made longer than the thickness D2 of the substrate 1 in the vertical direction, whereby the heat generated by the blue LED 2a is suppressed from being transmitted to the red LED 4a via the level direction of the substrate 1. Thereby, the deterioration of the luminous efficiency of the red LED 4a is suppressed. However, the present invention is not limited thereto, and the distance D1 may be an arbitrary value.

Further, as shown in FIG. 3, the height H1 of the sealing portion 3a is higher than the height H2 of the sealing portion 5a. This effect will be described later with reference to Fig. 5 . Further, the height H1 of the sealing portion 3a and the height H2 of the sealing portion 5a may be the same.

(Wiring of the light-emitting module of the first embodiment)

4 is a view showing electrical wiring of the light-emitting module of the first embodiment. As shown in FIG. 4, the light emitting module 10a includes: a first light emitting element and a second light emitting element, wherein the second light emitting element is an element connected in parallel with the first light emitting element, and a rate of change of luminous efficiency with respect to temperature change And the rate of change of the voltage is larger than that of the first illuminating element. Specifically, a first light-emitting element group in which a plurality of first light-emitting elements are connected in series, and a second light-emitting element group in which a plurality of second light-emitting elements are connected in series are connected in parallel. Further, a plurality of first light-emitting element groups are present, and a plurality of second light-emitting element groups are present, and the plurality of first light-emitting element groups are connected in parallel to the plurality of second light-emitting element groups. Further, the first light-emitting element group and the second light-emitting element group connected in parallel are connected to a common power supply path.

In the example shown in FIG. 4, the light-emitting module 10a includes on the substrate 1 an electrode 6a-1 connected to the electrode bonding portion 14a-1 of the illumination device 100a and a wiring 6a extending from the electrode 6a-1. Further, the light-emitting module 10a includes, on the substrate 1, an electrode 8a-1 connected to the electrode bonding portion 14b-1 of the illumination device 100a, and a wiring 8a extending from the electrode 8a-1.

Here, in the light-emitting module 10a, a plurality of blue LEDs 2a connected in series by a bonding wire 9a-1 on the substrate 1 are connected to the wiring 6a and the wiring 8a. Further, in the light-emitting module 10a, a plurality of reds connected in series by the wiring 9a-2 on the substrate 1 The LED 4a is connected to the wiring 6a and the wiring 8a. As a result, the plurality of blue LEDs 2a connected in series by the wiring 9a-1 and the plurality of red LEDs 4a connected in series by the wiring 9a-2 are connected in parallel.

In this manner, the plurality of blue LEDs 2a and the plurality of red LEDs 4a connected in series by the wiring 9a-1 and the wiring 9a-2 are connected in parallel, whereby the amount of current flowing into each of the blue LEDs 2a and the red LEDs 4a The temperature changes with the change of the temperature of the light-emitting element, so that the change in the output balance of the light outputted by each of the plurality of light-emitting elements can be suppressed. Details of the aspect in which the change in the output balance of light can be suppressed will be described later.

(Reflection of the luminescent color of each of the light-emitting elements of the first embodiment)

FIG. 5 is a view showing reflection of an illuminating color of each light-emitting element in the light-emitting module of the first embodiment. As a premise of FIG. 5, as described above, the refractive index n1 of the light of the sealing portion 3a, the refractive index n2 of the light of the sealing portion 5a, and the refraction of the enclosed gas enclosed in the space formed by the main body 11 and the outer cover 13 The rate n3 has a magnitude relationship of n3 < n1 < n2.

As described above, as indicated by the solid arrows in FIG. 5, according to the magnitude relationship of the refractive index, the light emitted by the red LED 4a is substantially totally reflected in the direction of the sealing portion 3a on the interface between the sealing portion 5a and the sealed gas. go ahead. Further, as indicated by the solid arrows in FIG. 5, the light which is reflected by the sealing portion 5a and the interface in which the gas is sealed and proceeds in the direction of the sealing portion 3a is in the sealing portion 5a and the sealing portion 3a in accordance with the magnitude relationship of the refractive index. Refraction occurs at the interface, and then proceeds to the inside of the sealing portion 3a.

On the other hand, as indicated by the arrow of the two-dot chain line in FIG. 5, according to the magnitude relationship of the refractive index, the light emitted by the blue LED 2a is in the sealing portion. 3a is refracted with the interface of the enclosed gas, and then proceeds toward the enclosed gas. Further, most of the light emitted by the blue LED 2a is reflected by the interface between the sealing portion 3a and the sealing portion 5a in accordance with the magnitude relationship of the refractive index. Further, the height H1 of the sealing portion 3a is higher than the height H2 of the sealing portion 5a. Therefore, the area of the interface between the sealing portion 3a and the sealing portion 5a can be reduced, and on the other hand, the area of the sealing portion 3a and the interface in which the gas is sealed can be further increased.

As described above, as shown in FIG. 5, most of the light emitted by the blue LED 2a and the light emitted from the red LED 4a are appropriately combined and emitted in the vicinity of the interface between the sealing portion 3a and the sealed gas, so that the light can be emitted. Uniformity is improved. Further, the light-emitting module 10a efficiently emits light emitted from the red LED 4a, and efficiently combines the light with the light emitted from the blue LED 2a. Therefore, the number of mounted red LEDs 4a can be reduced. Thereby, the light-emitting module 10a suppresses deterioration of the entire light-emitting characteristics due to deterioration of the light-emitting characteristics of the red LEDs 4a due to heat.

Further, as indicated by a broken line arrow in FIG. 5, a part of the light emitted by the red LED 4a is not reflected by the sealing portion 5a and the interface of the sealed gas, but is refracted, and then proceeds in the direction of the enclosed gas above the sealing portion 5a. On the other hand, as indicated by the arrow of the chain line in FIG. 5, a part of the light emitted from the blue LED 2a is refracted on the interface between the sealing portion 3a and the sealed gas, and then proceeds in the direction of the enclosed gas above the sealing portion 5a. . In this manner, even if a part of the light emitted from the red LED 4a is emitted upward from the sealing portion 5a, since the height of the sealing portion 3a is higher than the height of the sealing portion 5a, it is emitted from the upper portion of the sealing portion 3a on the sealing portion 5a side. The color of the light of the blue LED 2a and the red LED 4a emitted from the sealing portion 5a The color of the light is easily mixed more uniformly. Therefore, even if LEDs having different luminescent colors are disposed in different regions, the color unevenness of the mixed colors is further suppressed.

The light-emitting module 10a seals the second region in which the amount of light emission is small, for example, the red LED 4a, by using a transparent resin that does not contain a phosphor, thereby preventing the phosphor from absorbing light and improving luminous efficiency. Further, when the light-emitting module 10a uses a transparent resin having high diffusibility to seal a second region in which a predetermined number of red LEDs are disposed, the red light is effectively diffused, thereby suppressing the color of the LED module. All. That is, the light-emitting module 10a can reduce the color rendering property and the luminous efficiency of the emitted light.

Furthermore, in the first embodiment described above, the blue LEDs 2a are arranged in an annular shape on the substrate 1, and the red LEDs 4a are arranged in the vicinity of the center of the annular shape. However, it is not limited to an annular shape, and may be any shape as long as it is a rectangle, a rhombus, and other annular shapes.

Further, in the first embodiment described above, the following case is shown as an example, in which case there are a plurality of first light-emitting element groups, a plurality of second light-emitting element groups exist, and a plurality of first light-emitting element groups and A plurality of second light emitting element groups are connected in parallel. In other words, the case where the plurality of red LEDs 4a connected in series by the wiring 9a-2 and the plurality of blues connected in series by the wiring 9a-1 are shown as an example The LEDs 2a are connected in parallel. However, it is not limited to this. For example, the first light-emitting element and the second light-emitting element may be connected in parallel. In other words, a blue LED 2a can also be connected in parallel with the red LED 4a. In addition, for example, a first group of light-emitting elements can be connected in parallel with a second group of light-emitting elements. The ground connection may be performed by connecting one first light-emitting element group in parallel with the plurality of second light-emitting element groups, or may connect a plurality of first light-emitting element groups in parallel with one second light-emitting element group.

(Effect of the first embodiment)

According to the first embodiment, the light emitting module includes a first light emitting element, and includes a first light emitting element group in which a plurality of first light emitting elements are connected in series. In addition, the light emitting module includes a second light emitting element, and includes a second light emitting element group, and the second light emitting element has a larger rate of change of the luminous efficiency and a voltage change rate with respect to the temperature change than the first light emitting element. The second light-emitting element group is formed by connecting a plurality of second light-emitting elements in series and connected in parallel with the first light-emitting element group. As a result, it is possible to suppress a change in the output balance of light outputted by each of the plurality of light-emitting elements.

Further, according to the first embodiment, the first light-emitting element group and the second light-emitting element group connected in parallel are connected to the common power supply path, and the total power amount supplied to each of the light-emitting element groups does not occur at the time of lighting. In the case of a change, when the temperature of each of the light-emitting elements of each of the light-emitting element groups changes due to lighting, the current value flowing into each of the light-emitting element groups also changes. As a result, it is possible to suppress a change in the output balance of light outputted by each of the plurality of light-emitting elements.

That is, according to the first embodiment, the light-emitting module uses two kinds of light-emitting elements, the light-emitting efficiency and voltage change characteristics of one light-emitting element with respect to the driving temperature, and the light-emitting efficiency of the other light-emitting element with respect to the driving temperature. The voltage change characteristics are all sharp, and each type of light-emitting element group is electrically arranged in parallel. Here, for the relative drive temperature In the case of a light-emitting element having a large decrease in luminous efficiency, the magnitude of the decrease in the driving voltage is large, and therefore, the amount of current increases with respect to the other type of light-emitting element. As a result, it is possible to suppress a change in balance of outputs of various LED elements caused by changes in driving conditions or environments.

6 is a view showing an example of a relationship between temperature and luminous efficiency in a light-emitting element. FIG. 7 is a view showing an example of a relationship between a driving voltage and a temperature in a light-emitting element. R21 of FIG. 6 and R23 of FIG. 7 respectively represent values of red LEDs, and B22 of FIG. 6 and B24 of FIG. 7 represent values of blue LEDs. As shown in FIGS. 6 and 7, the red LED is compared with the blue LED, and the rate of change of the luminous efficiency with respect to the temperature change and the rate of change of the driving voltage are larger as compared with the blue LED.

8 is a view showing an example of a circuit diagram when a red LED and a blue LED are connected in parallel. FIG. 9 is a view showing an example of a circuit diagram when a red LED and a blue LED are connected in series. In the example shown in FIGS. 8 and 9, the following case is shown as an example. In this case, a plurality of red LEDs 4a are connected in series, and a plurality of blue LEDs 2a are connected in series. In addition, the case where the plurality of red LEDs 4a connected in series are present is present, and a plurality of groups of the plurality of blue LEDs 2a connected in series are present. Further, in the example shown in FIG. 9, the following case is shown as an example, in which case a plurality of blue LEDs 2a are connected in parallel, a plurality of red LEDs 4a are connected in parallel, and a plurality of blues connected in parallel are connected. The color LED 2a group is connected in series to a plurality of red LEDs 4a connected in parallel. Here, in the circuit diagram shown in FIG. 8, the red LED 4a and the blue LED 2a are connected in parallel as in the light-emitting module of the first embodiment. Pick up. The circuit diagram shown in Fig. 9 is a circuit diagram for comparison.

Here, the case where the change in the output balance of the light outputted by each of the plurality of light-emitting elements can be suppressed will be described using an example in which the temperature rises as an example using FIGS. 6 to 9 . When the temperature rises, as shown in FIG. 6, the luminous efficiency of the red LED 4a is greatly lowered as compared with the luminous efficiency of the blue LED 2a. As a result, in this state, the proportion of the red LEDs 4a in the light output from the light-emitting module becomes smaller as compared with before the temperature rise. That is, the output balance of light changes.

When the temperature rises, as shown in FIG. 7, the driving voltage of the red LED 4a is largely lowered as compared with the driving voltage of the blue LED 2a. Further, as shown in FIG. 8, when the red LED 4a and the blue LED 2a are connected in parallel, the same electric power is supplied to the red LED 4a and the blue LED 2a. In addition, the electric power is represented by voltage × current. As a result, since the driving voltage has been largely lowered as compared with the blue LED 2a, a relatively large current flows into the red which is drastically lowered in comparison with the blue LED 2a as compared with before the temperature rise. LED4a. As a result, the current flowing into the red LED 4a becomes large, and as a result, the output of the light emitted from the red LED 4a becomes large, and the ratio of the red LED 4a is reduced to a smaller extent than before the temperature rises, or the output balance does not change. In other words, it is possible to suppress a change in the output balance of light outputted by each of the plurality of light-emitting elements.

FIG. 10 is a view showing an example of the relationship between the temperature and the color temperature in the circuit diagram shown in FIG. 8 and the circuit diagram shown in FIG. 9. As shown in FIG. 10, the relationship 25 indicating the relationship in FIG. 8 is smaller than the relationship 26 indicating the relationship in FIG. 9, and the rate of change of the color temperature with respect to the temperature change becomes small. In other words, already It is known that the change in the output balance of the light outputted by each of the plurality of light-emitting elements is suppressed.

Further, according to the first embodiment, the luminous efficiency and voltage of the first light-emitting element and the second light-emitting element decrease as the temperature rises, and rise as the temperature decreases. As a result, it is possible to surely suppress a change in the output balance of the light outputted by each of the plurality of light-emitting elements.

Further, according to the first embodiment, the first light-emitting element is a blue LED (Light Emitting Diodes) element, and the second light-emitting element is a red LED element. As a result, it is possible to surely suppress a change in the output balance of the light outputted by each of the plurality of light-emitting elements.

Further, according to the first embodiment, there are a plurality of first light-emitting element groups, a plurality of second light-emitting element groups are present, and the plurality of first light-emitting element groups are connected in parallel with the plurality of second light-emitting element groups, the first The light-emitting element group is formed by connecting a plurality of first light-emitting elements in series, and the second light-emitting element group is formed by connecting a plurality of second light-emitting elements in series. As a result, it is possible to surely suppress a change in the output balance of the light outputted by each of the plurality of light-emitting elements.

Further, according to the first embodiment, the first light-emitting element group in which the plurality of first light-emitting elements are connected in series, and the second light-emitting element group in which the plurality of second light-emitting elements are connected in series are connected in parallel, and The rated condition of a group of light-emitting elements is equal to the rated condition of the second group of light-emitting elements. As a result, it is possible to further suppress the change in the output balance of the light outputted by each of the plurality of light-emitting elements.

[Second Embodiment]

Second Embodiment Compared with the first embodiment, the configuration of the LED Different states. The other points are the same as those of the first embodiment, and therefore, the description will be omitted. Fig. 11 is a plan view showing a light-emitting module of a second embodiment. Fig. 11 is a plan view of the light-emitting module 10b of the second embodiment as seen from the direction of the arrow A in Fig. 1 .

As shown in FIG. 11, the light-emitting module 10b has two first light-emitting element groups including a plurality of blue LEDs 2b disposed on a diagonal line on the substrate 1. Further, the light-emitting module 10b arranges two second light-emitting element groups including a plurality of red LEDs 4b on a diagonal line on the substrate 1, the diagonal line being related to the center of the substrate 1 and the first light-emitting element group The configuration is symmetrical diagonal.

The light-emitting module 10b includes, on the substrate 1, an electrode 6b-1 connected to the electrode bonding portion 14a-1 of the illumination device 100b, and a wiring 6b extending from the electrode 6b-1. Further, the light-emitting module 10b includes a wiring 8b on the substrate 1, and the wiring 8b is connected in parallel to the wiring 6b via the blue LED 2b and the red LED 4b, and the blue LED 2b is connected in series by the wiring 9b-1. The red LEDs 4b are connected in series by the wiring 9b-2. The wiring 8b includes an electrode 8b-1 connected to the electrode joint portion 14b-1 of the illumination device 100b at the extended front end. Furthermore, the blue LED 2b has the same thermal characteristics as the blue LED 2a of the first embodiment. In addition, the red LED 4b has the same thermal characteristics as the red LED 4a of the first embodiment.

As shown in FIG. 11, when the blue LED 2b and the red LED 4b are disposed on the substrate 1, the first region sealed by the sealing portion 3b and the second region sealed by the sealing portion 5b are located point-symmetric with respect to the center of the substrate 1. s position. Thereby, the light emitting module 10b can balance the blue LED 2b and the red color The light emitted by each of the LEDs 4b is synthesized, so that a desired pattern, brightness, or hue of light can be easily obtained.

[Third embodiment]

In the third embodiment, the arrangement of the LEDs is different from that of the first embodiment and the second embodiment. The other points are the same as those of the first embodiment and the second embodiment, and therefore, the description will be omitted. Fig. 12 is a plan view showing a light-emitting module of a third embodiment. Fig. 12 is a plan view of the light-emitting module 10c of the third embodiment as seen from the direction of the arrow A in Fig. 1 .

As shown in FIG. 12, the light-emitting module 10c arranges the first light-emitting element group including the plurality of blue LEDs 2c on the substrate 1 in one region obtained by equally dividing the substrate 1. Further, in the light-emitting module 10c, the second light-emitting element group including the plurality of red LEDs 4c is disposed on the substrate 1 in a region in which the substrate 1 is equally divided and the first light-emitting element group is not disposed. An area.

The light-emitting module 10c includes, on the substrate 1, an electrode 6c-1 connected to the electrode joint portion 14a-1 of the illumination device 100c, and a wiring 6c extending from the electrode 6c-1. Further, the light-emitting module 10c includes a wiring 8c on the substrate 1, and the wiring 8c is connected in parallel to the wiring 6c via a plurality of blue LEDs 2c and a plurality of red LEDs 4c, and the plurality of blue LEDs 2c are connected by the wiring 9c-1. Connected in series, the plurality of red LEDs 4c are connected in series by a wire 9c-2. The wiring 8c includes an electrode 8c-1 connected to the electrode joint portion 14b-1 of the illumination device 100c at the extended front end. Furthermore, the blue LED 2c has the same thermal characteristics as the blue LED 2a of the first embodiment. In addition, the red LED 4c has the same heat as the red LED 4a of the first embodiment. Sex.

As shown in FIG. 12, the blue LED 2c and the red LED 4c are concentrated on the substrate 1, and a first region sealed by the sealing portion 3c and a second region sealed by the sealing portion 5c are separately formed. Thereby, the control unit 14 of the illumination device 10c can easily drive and control the blue LED 2c and the red LED 4c, respectively, and can easily manage heat. Further, the light-emitting module 10c suppresses deterioration of the entire light-emitting characteristics due to deterioration of the light-emitting characteristics of the red LEDs 4c due to heat.

[Other embodiments]

For example, in the above embodiment, the blue LED 2a to the blue LED 2c are referred to as a first light-emitting element, and the red LED 4a to the red LED 4c are referred to as a second light-emitting element. However, it is not limited thereto, and any combination of the first light-emitting element and the second light-emitting element having thermal characteristics which are inferior to the thermal characteristics of the first light-emitting element may be employed regardless of the light-emitting color. Further, in the above embodiment, the sealing portions 3a to 3c and the sealing portions 5a to 5c have different materials, and each has a refractive index different from that of light. However, the sealing portion 3a to the sealing portion 3c and the sealing portion 5a to the sealing portion 5c may be made of the same material. Further, the sealing method of the blue LED 2a to the blue LED 2 c and the red LED 4 a to the red LED 4 c using the sealing portion 3 a to the sealing portion 3 c and the sealing portion 5 a to the sealing portion 5 c is not limited to the sealing method described in the embodiment, and various sealing methods may be used. method.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. this The scope of the invention is defined by the scope of the appended claims.

1‧‧‧Substrate

2a~2c‧‧‧Blue LED

3a~3c, 5a~5c‧‧‧ Sealing Department

4a~4c‧‧‧Red LED

6a~6c, 8a, 8b, 8c‧‧‧ wiring

6a-1, 6b-1, 6c-1, 8a-1, 8b-1, 8c-1‧‧‧ electrodes

9a-1, 9a-2, 9b-1, 9b-2, 9c-1, 9c-2‧‧‧ wiring

10a~10c‧‧‧Lighting Module

11‧‧‧Ontology

11a‧‧‧ recess

12a‧‧‧Light head components

12b‧‧‧Metal eye

13‧‧‧ Cover

14‧‧‧Control Department

14a, 14b‧‧‧Electrical wiring

14a-1, 14b-1‧‧‧electrode joint

15a, 15b‧‧‧Fixed components

25, 26‧‧ relationship

100a~100c‧‧‧Lighting device

A‧‧‧ arrow

B-B‧‧‧ profile

D1‧‧‧ distance

D2‧‧‧ thickness

H1, H2‧‧‧ height

Fig. 1 is a longitudinal sectional view showing an illuminating device to which a light-emitting module of a first embodiment is attached.

Fig. 2 is a plan view showing a light-emitting module of the first embodiment.

3 is a cross-sectional view showing an illumination device to which the light-emitting module of the first embodiment is mounted.

4 is a view showing electrical wiring of the light-emitting module of the first embodiment.

FIG. 5 is a view showing reflection of an illuminating color of each light-emitting element in the light-emitting module of the first embodiment.

FIG. 6 is a view showing an example of the relationship between the temperature of the light-emitting element and the luminous efficiency.

FIG. 7 is a view showing an example of a relationship between a driving voltage and a temperature of a light-emitting element.

8 is a view showing an example of a circuit diagram when a red LED and a blue LED are connected in parallel.

FIG. 9 is a view showing an example of a circuit diagram when a red LED and a blue LED are connected in series.

FIG. 10 is a view showing an example of the relationship between the temperature and the color temperature in the circuit diagram shown in FIG. 8 and the circuit diagram shown in FIG. 9.

Fig. 11 is a plan view showing a light-emitting module of a second embodiment.

Fig. 12 is a plan view showing a light-emitting module of a third embodiment.

2a‧‧‧Blue LED

3a, 5a‧‧‧ Sealing Department

4a‧‧‧Red LED

10a~10c‧‧‧Lighting Module

11‧‧‧Ontology

12a‧‧‧Light head components

12b‧‧‧Metal eye

13‧‧‧ Cover

14a, 14b‧‧‧Electrical wiring

14a-1, 14b-1‧‧‧electrode joint

100a~100c‧‧‧Lighting device

A‧‧‧ arrow

Claims (6)

A light emitting module, comprising: a first light emitting element group having a first light emitting element, and a plurality of the first light emitting elements are connected in series; and a second light emitting element group having a second light emitting element, and a plurality of the second light-emitting elements are connected in series, and are connected in parallel with the first light-emitting element group, and the second light-emitting elements are compared with the first light-emitting elements, and the luminous efficiency is changed with respect to temperature The rate of change and the rate of change of voltage are greater. The lighting module according to claim 1, wherein the first light-emitting element group and the second light-emitting element group connected in parallel are connected to a common power supply path, and each of the light is emitted even when lighting The temperature of the element group changes, and the total amount of electric power supplied to each of the light-emitting element groups does not change. When the temperature of each of the light-emitting element groups changes when lighting, the current value flowing into each of the light-emitting element groups A change has occurred. The light-emitting module according to claim 1, wherein the luminous efficiency and the voltage of the first light-emitting element and the second light-emitting element decrease as the temperature rises, and rise as the temperature decreases. The lighting module according to claim 1, wherein the first light emitting element is a blue LED (Light Emitting Diodes) element, and the second light emitting element is a red LED element. The lighting module according to claim 1, wherein said first light-emitting element group has a rated condition equal to a rated condition of said second light-emitting element group. The light emitting module according to claim 1, wherein a plurality of the first light emitting element groups are present, a plurality of the second light emitting element groups, a plurality of the first light emitting element groups, and a plurality of The second group of light emitting elements are connected in parallel.